首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
What has cloning bypassed?
What has cloning bypassed?
admin
2010-06-30
67
问题
What has cloning bypassed?
What is cloning? Cloning is the creation of cells or whole animals using DNA from a single "parent", by passing the normal reproductive process. The clone has the same DNA as the parent.
The most common process takes DNA from one cell and puts it in a hollowed-out egg. Chemicals and electricity are then used to encourage the new DNA to fuse with the egg and develop into an embryo. This technique is called nuclear transfer.
The first cloned animal in human history is a sheep called Doily. It is very important because it was the first mammal to be cloned using DNA taken from an adult cell. Previously, animals had only been cloned using embryo cells, which already have the potential to become a complete embryo in its own right. The big breakthrough with Doily was to make a clone from an ordinary, adult cell.
When it comes to the question of whether cloned animals are normal and healthy, the answer is YES. Dolly is, but scientists do not yet know whether this is the exception or the rule. Some early evidence suggests that clones may have health problems and that they may age prematurely.
With the birth of Dolly; many people are worried that a human clone may be born soon. It’s possible in theory. But the technology of reproductive cloning is still in its very early stages and there is much that scientist do not understand. That’s more, human cloning is already banned by law in the United Kingdom. The former President of the United States Bill Clinton proposed banning research into producing human clones in the US for five years. Some measures have also been taken to establish international agreements banning live human clones.
选项
A、It makes a clone from an ordinary, adult cell.
B、It makes the first normal and healthy cloned animal.
C、It paves the way to the cloning of human beings.
D、It makes a cloned animal with only mother.
答案
A
解析
此题考查多利羊出世在技术上有何突破,关键词是breakthrough,否则很可能想当然地选择其他选项。
转载请注明原文地址:https://kaotiyun.com/show/lsJd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Whereispopulationgrowthhappening?
Thepressisconstantlyremindingusthatthedramaticincreaseintheageofourpopulationoverthenext30orsoyearswillc
Youmaysaythatthebusinessofmarkingbooksisgoingtoslowdownyourreading.【C1】______probablywill.That’soneofthe【C2】
Youmaysaythatthebusinessofmarkingbooksisgoingtoslowdownyourreading.【C1】______probablywill.That’soneofthe【C2】
Payandproductivity,itisgenerallyassumed,shouldberelated.Buttherelationshipseemstoweaken【C1】______peoplegetolder
Payandproductivity,itisgenerallyassumed,shouldberelated.Buttherelationshipseemstoweaken【C1】______peoplegetolder
Payandproductivity,itisgenerallyassumed,shouldberelated.Buttherelationshipseemstoweaken【C1】______peoplegetolder
Culturalglobalization,formany,meansWesternizationorAmericanization.Animportantdistinctionconcerningtoday’scultural
ThepagesoftheHarvardBusinessReviewarenotusuallypopulatedbynovelists.ButJosephFinderisjustsuchararity.Recent
Whatarefeelingsfor?Mostnonscientistswillfindthisastrangequestion.Feelingsjustifythemselves.Emotionsgivemeaning
随机试题
宗教领袖所具有的权威通常来自()。
皮带防护罩与皮带的距离不要小于50mm,设计要合理,不要影响机器的运行,需要设置防护罩的是()。
下列有关危险因素的叙述不正确的是()。
银行承兑汇票市场的特点不包括()。
简析极权主义的媒介规范理论。
近期国际金融危机对于毕业生的就业影响非常大,某高校就业中心的陈老师希望广大同学能够调整自己的心态和预期。他在一次就业指导会上提出,有些同学对自己的职业定位还不够准确。如果陈老师的陈述为真,则以下哪项不一定为真?Ⅰ.不是所有的人对自己的职业定位都准确。
[A]Asitssubtitlesuggests,thisisaromanticbookaboutsomeyoungRomantics,butitsetsoffbyofferingarevisionistinte
下面程序的执行结果是()。PrivateSubCommand1_Click()a=0k=1DoWhilek<4x=k^k^ak=k+1Printx;Loop
Whywastheseminardelayed?
NooneexceptKennyandAnn______toNewYorkbefore.
最新回复
(
0
)